Accelerator for vulcanizing rubber compounds



' No Drawing. Application filed September .5, 1930, SeriaI No. 480,021; .andin Germany lIovemberjS 132 7.

Patented Aug. 23, 1932 ATES PATENT WILHELIVI L MMEL; or wIEsnonr-on-rHEmHINE, mnznonon eoos'rlon LEVERKUSEN:

ON-THE-RHINE, Ann HERMANN' FRIEDRICH, or WIESDORE-ON-THE-BI-IINE, GER- MANY, ASSIGNORS TO I. e. FARZBENINDUSTRIE AKTIENGESELLSCHAIT, or FRANK- Y FORT-ON-THE-MAIN, GERMANY i ACCELERATOR non vuncnnrzme RUBBER comrcunns The present invention relates to a process of vulcanizing rubber compounds and 0011- sists in effecting the-vulcanization in the presence of "an acceleratoriof the probable formula: v

N Ra wherein R means the'cyclohexyl group or a homologue thereof, R stands for a hydrocarbon radical which may be linked up with R to form a ring configuration." 'The invention furthermore relates to the vulcanized wrubber compounds obtainable by the process above identified. f 1

In accordance with the invention ammpound of the above formula is incorporated, for example, by rolling or kneading Within the rubber compounds to be vulcanizedto- I gether with or apart-from the other ingredients usually employed 'in'vulcanization processes, such as sulfur, selenium, aromatic nitro compounds metal oxides or other vulcanizing agents, fillers, plastilizing agents, pigments, etc. vulcanization of themixtures thus produced is performed'by heating with or without the application of superatmos pheric pressure, advantageouslyto temperar V tures between about 100 150 C.

It may be mentioned that the term rubber compound is intended to include natural rubber varieties "and artificial rubber like masses obtainable by polymerizing a rubber forming hydrocarbon, such as butadiene- (1.3) or homologues or analogues thereof alone or in admixture with otherusuitable compounds-capable of being polymerized,

suchasstyrol, vinylnaphthalenes,etc; Ob-

viouslyyinstead of a single one of our vula canizatlon accelerators, mixtures of two or more of the same may beemployed and if desired, accelerators of another used simultaneously.

Instead of the'free bases described as ac- V celerators also salts thereof, for example, the

carbonates, borates, oleates, stearates, etc. may be employed. *These salt's'show an accelerating action similar to that shown by the bases themselves. They probably dissotype may be.

ciate during the vulcanization into acid I V 'base'and the latter acts as acceleratorjn the The following examples will illustrate the invention without restricting -it thereto, the parts beingby weight. f

Example 111b I parts of smoked; sheets :1 i; .1 1

5 parts of zinc oxide 4 parts of sulfur 1' part of stearic acid 2 parts of 'ethylcyclohexylamine of the probable formula 2 t' are mixed rolling or i kneading and the mixture is vulcanized'at 14:5? 0. 0130, ,min-

utes. A vulcanizate"i'sthus'obt ained showing a tensile strengthof; about 201 kg/sq cm at a stretch of about-803%.

100 parts of smoked sheets 7 parts of sulfur-1 :j

40 parts of zinc oxide""-- 3 parts of dicyclohexylamine of th V able formula are mixed by rolling or lmeading and the mixture is vulca-nized at C. for 30 minutes. A vulcanizatejis thus obtained showing a tensile strength ofabout 168 kg/sq cm at a stretch of about. 670%. a

min

Ewample 3 100 parts of smoked sheets 5 parts of zinc oxide 4 parts of sulfur 1 part of stearic acid 7 2 parts of dekahydroquinaldine of the probable formula;

aremixed'by rolling or 'kneading'and'the mixture is vulcanized at 135 C. for 20 minutes. A vulcanizate is. thus obtained showing a tensile strength ofabout 2 H kg/sq cm at a stretch. of about 823%.

1OOIparts of butadiene sodium rubber 60 parts of carbon black I p 15 parts of zinc oxide 2 parts of colophony '2 parts of tar oil 2 parts of stearic acid 2 parts of sulfur 1 part of perhydromethylindole of the probable formula: r

HHH

are mixed by rolling or kneading and the mixture is vulcanizedat 140 C. for 120 minutes, A vulcanizate is thus obtained showing a tensile strength of about 200 kg/sq cm at a stretch of about 630%.

Similar results will be obtained by replacing the accelerators employed in the, above examples, for instance, by:

H: Hi. i v

2 l /NH Hz Hz i 7H.- t. H a 2 \NH.

\NH CaHa We claim V 1.' Process forthe manufacture of vulcanized rubber compounds which consists in efiecting the vulcanization in the presence of an accelerator. of the probable formula wherein R stands for the cyclohexyl group or a homologue thereof and R for a hydrocarbon residuewhich may be linked up with l. Process for the manufacture of vulcanized rubber compounds which'consists in efi'ectingthe vulcanization in'the presence of an accelerator of the probable formula 7 H H H V H: 5'. Process" for the manufacture of vulcanized rubber compoundswhich consists in effecting the vulcanization in the presence of an accelerator of the probable formula 6. As new products of manufacture vul-r canized rubber compounds obtainable accord ing; to claim l.

7. As new products of manufacture vulcanized rubber compounds obtainable according to claim 2.

8. As new products of manufacture vulcanized rubber compounds obtainable according to claim 3.

9. As new products of manufacture vulcanized rubber compounds obtainable according to claim 4.

10. As new products of manufacture vulcanized rubber compounds obtainable according to claim 5.

In testimony whereof, we afiix our signatures. .7

WILHELM LOMMEL. THEODOR GOOST. HERMANN FRIEDRICH. 

